The 20 - 44 metre wide asteroid 2014 KA91 will make a close pass (9.1 lunar distances, 0.0235 AU), travelling at 8.44 km/second, to the Earth-Moon system on the 6th June 2014 @ 17:27 UT ±00:01.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).